/*
 * File    : TrackerImpl.java
 * Created : 08-Dec-2003
 * By      : parg
 * 
 * Azureus - a Java Bittorrent client
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details ( see the LICENSE file ).
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package org.gudy.azureus2.pluginsimpl.local.tracker;

/**
 * @author parg
 *
 */

import java.net.InetAddress;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;

import org.gudy.azureus2.core3.tracker.host.TRHost;
import org.gudy.azureus2.core3.tracker.host.TRHostAuthenticationListener;
import org.gudy.azureus2.core3.tracker.host.TRHostFactory;
import org.gudy.azureus2.core3.tracker.host.TRHostListener2;
import org.gudy.azureus2.core3.tracker.host.TRHostTorrent;
import org.gudy.azureus2.core3.tracker.util.TRTrackerUtils;
import org.gudy.azureus2.core3.util.AEMonitor;
import org.gudy.azureus2.core3.util.Debug;
import org.gudy.azureus2.plugins.torrent.Torrent;
import org.gudy.azureus2.plugins.tracker.Tracker;
import org.gudy.azureus2.plugins.tracker.TrackerException;
import org.gudy.azureus2.plugins.tracker.TrackerListener;
import org.gudy.azureus2.plugins.tracker.TrackerTorrent;
import org.gudy.azureus2.plugins.tracker.web.TrackerAuthenticationAdapter;
import org.gudy.azureus2.plugins.tracker.web.TrackerAuthenticationListener;
import org.gudy.azureus2.plugins.tracker.web.TrackerWebContext;
import org.gudy.azureus2.pluginsimpl.local.torrent.TorrentImpl;

public class TrackerImpl extends TrackerWCHelper implements Tracker, TRHostListener2, TRHostAuthenticationListener {
    private static TrackerImpl singleton;
    private static AEMonitor class_mon = new AEMonitor("Tracker");

    private List listeners = new ArrayList();

    private TRHost host;

    private List<TrackerAuthenticationListener> auth_listeners = new ArrayList<TrackerAuthenticationListener>();

    public static Tracker getSingleton() {
        try {
            class_mon.enter();

            if (singleton == null) {

                singleton = new TrackerImpl(TRHostFactory.getSingleton());
            }

            return (singleton);

        } finally {

            class_mon.exit();
        }
    }

    protected TrackerImpl(TRHost _host) {
        setTracker(this);

        host = _host;

        host.addListener2(this);
    }

    public String getName() {
        return (host.getName());
    }

    public void setEnableKeepAlive(boolean enable) {
        Debug.out("Keep alive setting ignored for tracker");
    }

    public URL[] getURLs() {
        URL[][] url_sets = TRTrackerUtils.getAnnounceURLs();

        URL[] res = new URL[url_sets.length];

        for (int i = 0; i < res.length; i++) {

            res[i] = url_sets[i][0];
        }

        return (res);
    }

    public InetAddress getBindIP() {
        return (host.getBindIP());
    }

    public TrackerTorrent host(Torrent _torrent, boolean _persistent)

    throws TrackerException {
        return (host(_torrent, _persistent, false));
    }

    public TrackerTorrent host(Torrent _torrent, boolean _persistent, boolean _passive)

    throws TrackerException {
        TorrentImpl torrent = (TorrentImpl) _torrent;

        try {
            return (new TrackerTorrentImpl(host.hostTorrent(torrent.getTorrent(), _persistent, _passive)));

        } catch (Throwable e) {

            throw (new TrackerException("Tracker: host operation fails", e));
        }
    }

    public TrackerTorrent publish(Torrent _torrent)

    throws TrackerException {
        TorrentImpl torrent = (TorrentImpl) _torrent;

        try {
            return (new TrackerTorrentImpl(host.publishTorrent(torrent.getTorrent())));

        } catch (Throwable e) {

            throw (new TrackerException("Tracker: publish operation fails", e));
        }
    }

    public TrackerTorrent[] getTorrents() {
        TRHostTorrent[] hts = host.getTorrents();

        TrackerTorrent[] res = new TrackerTorrent[hts.length];

        for (int i = 0; i < hts.length; i++) {

            res[i] = new TrackerTorrentImpl(hts[i]);
        }

        return (res);
    }

    public TrackerTorrent getTorrent(Torrent torrent) {
        TRHostTorrent ht = host.getHostTorrent(((TorrentImpl) torrent).getTorrent());

        if (ht == null) {

            return (null);
        }

        return (new TrackerTorrentImpl(ht));
    }

    public TrackerWebContext createWebContext(int port, int protocol)

    throws TrackerException {
        return (new TrackerWebContextImpl(this, null, port, protocol, null));
    }

    public TrackerWebContext createWebContext(String name, int port, int protocol)

    throws TrackerException {
        return (new TrackerWebContextImpl(this, name, port, protocol, null));
    }

    public TrackerWebContext createWebContext(String name, int port, int protocol, InetAddress bind_ip)

    throws TrackerException {
        return (new TrackerWebContextImpl(this, name, port, protocol, bind_ip));
    }

    public void torrentAdded(TRHostTorrent t) {
        try {
            this_mon.enter();

            for (int i = 0; i < listeners.size(); i++) {

                ((TrackerListener) listeners.get(i)).torrentAdded(new TrackerTorrentImpl(t));
            }
        } finally {

            this_mon.exit();
        }
    }

    public void torrentChanged(TRHostTorrent t) {
        for (int i = 0; i < listeners.size(); i++) {

            ((TrackerListener) listeners.get(i)).torrentChanged(new TrackerTorrentImpl(t));
        }
    }

    public void torrentRemoved(TRHostTorrent t) {
        try {
            this_mon.enter();

            for (int i = 0; i < listeners.size(); i++) {

                ((TrackerListener) listeners.get(i)).torrentRemoved(new TrackerTorrentImpl(t));
            }
        } finally {

            this_mon.exit();
        }
    }

    public void addListener(TrackerListener listener) {
        try {
            this_mon.enter();

            listeners.add(listener);

            TrackerTorrent[] torrents = getTorrents();

            for (int i = 0; i < torrents.length; i++) {

                listener.torrentAdded(torrents[i]);
            }
        } finally {

            this_mon.exit();
        }
    }

    public void removeListener(TrackerListener listener) {
        try {
            this_mon.enter();

            listeners.remove(listener);

        } finally {

            this_mon.exit();
        }
    }

    public boolean authenticate(String headers, URL resource, String user, String password) {
        for (int i = 0; i < auth_listeners.size(); i++) {

            try {
                TrackerAuthenticationListener listener = auth_listeners.get(i);

                boolean res;

                if (listener instanceof TrackerAuthenticationAdapter) {

                    res = ((TrackerAuthenticationAdapter) listener).authenticate(headers, resource, user, password);

                } else {

                    res = listener.authenticate(resource, user, password);
                }

                if (res) {

                    return (true);
                }
            } catch (Throwable e) {

                Debug.printStackTrace(e);
            }
        }

        return (false);
    }

    public byte[] authenticate(URL resource, String user) {
        for (int i = 0; i < auth_listeners.size(); i++) {

            try {
                byte[] res = ((TrackerAuthenticationListener) auth_listeners.get(i)).authenticate(resource, user);

                if (res != null) {

                    return (res);
                }
            } catch (Throwable e) {

                Debug.printStackTrace(e);
            }
        }

        return (null);
    }

    public void addAuthenticationListener(TrackerAuthenticationListener l) {
        try {
            this_mon.enter();

            auth_listeners.add(l);

            if (auth_listeners.size() == 1) {

                host.addAuthenticationListener(this);
            }
        } finally {

            this_mon.exit();
        }
    }

    public void removeAuthenticationListener(TrackerAuthenticationListener l) {
        try {
            this_mon.enter();

            auth_listeners.remove(l);

            if (auth_listeners.size() == 0) {

                host.removeAuthenticationListener(this);
            }
        } finally {

            this_mon.exit();
        }
    }

    public void destroy() {
        super.destroy();

        auth_listeners.clear();

        host.removeAuthenticationListener(this);

        listeners.clear();

        host.close();
    }
}
